Finding the Fourth Proportional to 404,320.52, 606,553.40 and 138,018.75

Step by Step Solution

1. Step 1: Write the proportion equation
   404,320.52 : 606,553.40 = 138,018.75 : x
2. Step 2: Convert to fraction form
   404,320.52/606,553.40 = 138,018.75/x
3. Step 3: Cross multiply
   404,320.52x = 606,553.40 × 138,018.75
4. Step 4: Simplify right side
   404,320.52x = 83,715,740,146.72
5. Step 5: Solve for x
   x = 83,715,740,146.72/404,320.52
6. Step 6: Final answer
   x = 207,052.91